JP6705335B2 - Vehicle display control device and vehicle driving assist system - Google Patents

Description

The present invention relates to a vehicle display control device and a vehicle driving assist system including the same.

2. Description of the Related Art A head-up display (hereinafter, referred to as HUD) that projects a display image on a projection member that transmits a foreground in a vehicle and displays the display image as a virtual image so that the user can visually recognize the display image has been conventionally known. ing. Such a HUD is widely used, for example, in a vehicle driving assist system that assists the user in driving the vehicle.

Now, in order to control the virtual image display by HUD, Patent Document 1 discloses a vehicle display control technique that changes the brightness of a display image based on tunnel information before passing through the entrance of a tunnel. .. Here, as the tunnel information, position information and shape information regarding the entrance and exit of the tunnel are adopted.

JP, 2015-127170, A

However, in the technology disclosed in Patent Document 1, the tunnel information is only map data stored in a server device that can communicate with the navigation device or the own vehicle, and therefore does not reflect the inside and outside conditions of the tunnel in a timely and accurate manner. A situation is expected. As described above, the display image displayed as the virtual image based on the timely and inaccurate tunnel information is visually legible (hereinafter referred to as “visual legibility”) with respect to the foreground that is the background of the display in the vehicle. ) Could be reduced.

The present invention has been made in view of the problems described above, and an object thereof is to ensure the visual legibility of a display image displayed as a virtual image with respect to the foreground inside and outside the tunnel, which is the background of the display in the vehicle. A vehicle display control device and a vehicle driving assist system are provided.

The technical means of the invention for achieving the object will be described below. Incidentally, the reference numerals in parentheses described in the claims disclosing the technical means of the present invention and this column indicate the corresponding relationship with the specific means described in the embodiments described in detail later, It does not limit the technical scope of the invention.

The first invention disclosed to solve the above problems is
In a vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image so that it can be visually recognized by the user. A vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S103 , S108 ) for acquiring tunnel internal information (Ii) transmitted from the outside of the vehicle by wireless communication and representing the internal state of the tunnel (7),
An adjustment unit (S105 , S110 ) for adjusting the brightness of the display image in accordance with the tunnel internal information acquired by the information acquisition unit at the entrance adjustment timing (T1) before the entrance (7a) of the tunnel. ,
The information acquisition unit acquires tunnel internal information including illuminance information inside the tunnel,
At the entrance adjustment timing, the adjustment unit adjusts the brightness of the display image in accordance with at least the illuminance information in the tunnel internal information acquired by the information acquisition unit.

According to the first aspect of the invention, at the entrance adjustment timing before the entrance of the tunnel, the brightness of the display image is adjusted in accordance with the tunnel internal information acquired by the information acquisition unit. Here, since the tunnel internal information indicating the internal state of the tunnel is transmitted and acquired from the outside of the vehicle by wireless communication, the internal state immediately before the vehicle enters the tunnel entrance is timely and accurate. Can be reflected in. Therefore, according to the timely and accurate adjustment based on the inside information of the tunnel, the display image with the brightness that can ensure the visual comprehensibility of the foreground, which is the background of the display, can be displayed when entering the tunnel entrance. Accordingly, a virtual image can be displayed.

Further, the second invention disclosed to solve the above-mentioned problems,
In a vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image so that it can be visually recognized by the user. A vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S108) for acquiring tunnel external information (Io) transmitted from the outside of the vehicle by wireless communication and representing the external state of the tunnel (7);
An exit adjustment timing (T2) before the exit (7b) of the tunnel, and an adjustment unit (S110) for adjusting the brightness of the display image in accordance with the external information of the tunnel acquired by the information acquisition unit,
The information acquisition unit acquires tunnel outside information including illuminance information outside the tunnel,
At the exit adjustment timing, the adjustment unit adjusts the brightness of the display image according to at least the illuminance information in the tunnel external information acquired by the information acquisition unit.
On the other hand, the third invention disclosed to solve the above problems,
In a vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image so that it can be visually recognized by the user. A vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S108) for acquiring tunnel external information (Io) transmitted from the outside of the vehicle by wireless communication and representing the external state of the tunnel (7);
An exit adjustment timing (T2) before the exit (7b) of the tunnel, and an adjustment unit (S110) for adjusting the brightness of the display image in accordance with the external information of the tunnel acquired by the information acquisition unit,
A display control device for a vehicle that controls a virtual image display in a first display area (A1) that associates a display image with a specific object in the foreground and a virtual image display in a second display area (A2) that excludes the association. In (54),
The adjustment unit adjusts the brightness of the display image in the first display area at the exit adjustment timing ,
The information acquisition unit acquires tunnel outside information including illuminance information outside the tunnel,
At the exit adjustment timing, the adjustment unit adjusts the brightness of the display image in accordance with at least the illuminance information in the tunnel external information acquired by the information acquisition unit.

According to the second and third aspects, the brightness of the display image is adjusted at the exit adjustment timing before the exit of the tunnel in accordance with the external information of the tunnel acquired by the information acquisition unit. Here, since the external information of the tunnel, which represents the external condition of the tunnel, is acquired by being transmitted by wireless communication from outside the own vehicle, the external condition immediately before the exit of the own vehicle at the tunnel exit is timely and accurate. Can be reflected in. Therefore, according to the timely and accurate adjustment according to the external information of the tunnel, the display image of the brightness at which the visibility and the legibility of the foreground, which is the background of the display of the vehicle, can be ensured, can be displayed at the tunnel exit. The virtual image can be displayed according to the exit.

Furthermore, the fourth invention disclosed to solve the above-mentioned problems is
In a vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image so that it can be visually recognized by the user. A vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S103 , S108 ) for acquiring the tunnel inside/outside information (I) transmitted from outside the vehicle by wireless communication and representing the inside/outside state of the tunnel (7),
A restriction unit (S104) that restricts the provided information to be provided to the user by the display image to the tunnel inside information (Ii) representing the inside state of the tunnel, out of the tunnel inside/outside information acquired by the information acquisition unit. , S106 , S109, S111 ).

According to the fourth aspect of the invention, in the tunnel, the provided information by the display image is limited to the tunnel inside information out of the tunnel inside/outside information acquired by the information acquisition unit. Here, since the tunnel inside information indicating the inside condition of the tunnel is acquired by being transmitted by wireless communication from outside the own vehicle as the inside and outside information indicating the inside and outside conditions of the tunnel, the inside condition when the own vehicle is traveling. Can be reflected in a timely and accurate manner. Therefore, according to the timely and accurate restriction to the information type, when traveling inside the tunnel, the provided information is limited to the amount of information that can ensure the visual legibility of the foreground that is the background of the display in the vehicle. The display image representing the provided information can be displayed as a virtual image.

Furthermore, the fifth invention disclosed to solve the above-mentioned problems is
A vehicle driving assist system for assisting driving of a host vehicle,
A vehicle display control device (54) according to any one of the first to fourth inventions;
And a HUD (50).

In such a fifth invention, by the vehicle display control device according to any one of the above-mentioned first to fourth inventions, a display image displayed as a virtual image with respect to the foreground inside or outside the tunnel which is the background of the display in the own vehicle. It is possible to secure the visual readability of the.

FIG. 1 is an interior view showing the interior of a vehicle equipped with a vehicle driving assistance system according to an embodiment. 1 is a block diagram showing a vehicle driving assist system according to an embodiment. It is a structural diagram which shows typically the detailed structure of HUD of FIGS. It is a front view which shows the virtual image display state by HUD of FIGS. It is a front view which shows the virtual image display state by HUD of FIGS. It is a front view which shows the virtual image display state by HUD of FIGS. It is a front view which shows the virtual image display state by HUD of FIGS. 3 is a flowchart showing a display control flow by the HCU of FIG. 2. It is a schematic diagram for demonstrating the processing content in S101 and S107 of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a front view which shows the modification of FIG.

An embodiment of the present invention will be described below with reference to the drawings.

A vehicle driving assist system 1 of an embodiment to which the present invention is applied is mounted on a host vehicle 2 as shown in FIGS. 1 and 2, and can particularly assist driving of the host vehicle 2 when passing through a tunnel 7. ing.

As shown in FIG. 2, the vehicle driving assist system 1 is configured to include a peripheral monitoring system 3, a vehicle control system 4, and a display system 5. These systems 3, 4, 5 are connected to each other via an in-vehicle network 6 such as a LAN (Local Area Network).

The peripheral monitoring system 3 includes an external sensor 30 and a peripheral monitoring ECU (Electronic Control Unit) 31. The external world sensor 30 detects obstacles such as other vehicles, artificial structures, human beings, animals, and the like that exist in the external world of the vehicle 2 and may collide with them, and traffic-related objects existing in the external world. .. The external sensor 30 is, for example, one or more of sonar, radar, LIDAR (Light Detection and Ranging / Laser Imaging Detection and Ranging), a camera, and the like.

Specifically, the sonar is an ultrasonic sensor installed in, for example, the front portion or the rear portion of the vehicle 2. The sonar receives the reflected wave of the ultrasonic wave transmitted to the detection area in the outside of the host vehicle 2, detects the obstacle in the detection area, and outputs the detection signal. The radar is a millimeter wave sensor or a laser sensor installed in, for example, the front portion or the rear portion of the host vehicle 2. The radar detects the obstacle in the detection area and outputs a detection signal by receiving the reflected wave of the millimeter wave or the quasi-millimeter wave transmitted to the detection area in the external environment of the vehicle 2. The LIDAR is a laser scanner installed in the roof portion or the like of the vehicle 2. The LIDAR detects the obstacle in the detection area by receiving the reflected wave of the laser transmitted to the detection area in the external environment of the vehicle 2, and outputs the detection signal. The camera is a monocular or compound-eye type camera installed in, for example, a room mirror or a door mirror of the vehicle 2. The camera captures an image of the detection area in the external environment of the vehicle 2, detects an obstacle and a traffic-related object in the detection area, and outputs an image signal.

The peripheral monitoring ECU 31 is mainly composed of a microcomputer having a processor and a memory, and is connected to the external sensor 30 and the in-vehicle network 6. The periphery monitoring ECU 31 outputs obstacle information such as the type of obstacle (including the vehicle type if the obstacle is another vehicle) and the relative position of the obstacle with respect to the own vehicle 2 to the external sensor 30. Get based on the signal. At the same time, the peripheral monitoring ECU 31 acquires, for example, sign information such as a speed limit sign and a lane sign, traveling road information such as a white line and a road surface condition, and tunnel information regarding the tunnel 7 based on the output signal of the external sensor 30.

The vehicle control system 4 includes a vehicle state sensor 40, an occupant sensor 41, and a vehicle control ECU 42. The vehicle state sensor 40 is connected to the in-vehicle network 6. The vehicle state sensor 40 detects the traveling state of the vehicle 2. The vehicle state sensor 40 is, for example, at least the wireless communication device 40a in the present embodiment among the wireless communication device 40a, the vehicle speed sensor, the rotation speed sensor, the steering angle sensor, the fuel sensor, the water temperature sensor, and the GPS (Global Positioning System) receiver. One type or multiple types including.

Specifically, the wireless communication device 40a is selected from one or a plurality of types of communication devices external to the own vehicle 2, such as another vehicle transmitter or a mobile terminal for inter-vehicle communication and a roadside device for road-to-vehicle communication. By receiving the radio wave transmitted by communication, various information represented by the radio wave is generated. In particular, the wireless communication device 40a according to the present embodiment uses tunnel internal information Ii indicating the internal situation of the tunnel 7 as tunnel internal/external information I (for example, see FIG. 8) indicating the internal/external situation of the tunnel 7 through which the vehicle 2 passes. , Tunnel external information Io representing the external information of the tunnel 7 is generated. As the tunnel internal information Ii, at least illuminance information, traffic information, travel route information, and tunnel information are generated. On the other hand, as the tunnel external information Io, at least illuminance information, traffic information, travel route information, and weather information are generated.

Here, the illuminance information is physical information representing the external illuminance of the vehicle 2. The traffic information includes, for example, obstacle information such as inter-vehicle distance information between another vehicle that is an obstacle and the own vehicle 2, traffic jam information in front of the own vehicle 2, broken vehicle information, accident vehicle information, and fallen object information. Of these, in the present embodiment, there is one or more types including at least obstacle information. The tunnel information is, for example, at least reachable distance information among the reachable distance information to the entrance 7a and the exit 7b of the tunnel 7 (see, for example, FIGS. 1, 4 to 7, and 9) and the structural information of the entrance 7a and the exit 7b. One type or multiple types including. The traveling road information is, for example, one type or a plurality of types including at least road surface information in the present embodiment, among road surface information indicating a road surface state such as a frozen state and shape information indicating a road shape such as a slope and a curve. is there. The weather information includes, for example, weather information indicating weather conditions such as fine weather, rainy weather, cloudy weather, and snowfall, outside light information indicating outside light conditions such as the direction of sunlight, and temperature information indicating the outside temperature of the vehicle 2. In this embodiment, there are a plurality of types including at least weather information and temperature information.

The vehicle speed sensor detects the vehicle speed of the host vehicle 2 and outputs a vehicle speed signal corresponding to the detection. The rotation speed sensor detects the engine rotation speed of the internal combustion engine in the host vehicle 2 and outputs a rotation speed signal corresponding to the detection. The rudder angle sensor detects the rudder angle of the host vehicle 2 and outputs a rudder angle signal corresponding to the detection. The fuel sensor detects the remaining amount of fuel in the fuel tank of the vehicle 2 and outputs a fuel signal corresponding to the detection. The water temperature sensor detects the cooling water temperature of the internal combustion engine in the vehicle 2, and outputs a water temperature signal corresponding to the detection. The GPS receiver receives the radio waves transmitted from the GPS satellites to acquire position information regarding the traveling position of the vehicle 2.

The occupant sensor 41 is connected to the in-vehicle network 6. The occupant sensor 41 detects the state or operation of the user who is in the passenger compartment 2a of the vehicle 2 shown in FIG. The occupant sensor 41 is, for example, one or a plurality of types including a power switch, a user status monitor, a display setting switch, a turn switch, an automatic control switch, and the like in the present embodiment.

Specifically, the power switch is operated by the user in the vehicle interior 2a to start the internal combustion engine or the motor generator of the host vehicle 2, and outputs a power signal corresponding to the operation. The user state monitor detects the user state by capturing an image of the user state on the driver's seat 20 in the passenger compartment 2a and outputs an image signal. The display setting switch is operated by the user to set the display state in the vehicle interior 2a, and thereby outputs the display setting signal according to the operation. The turn switch is operated by the user in the passenger compartment 2a to operate the turn indicator of the host vehicle 2, and thereby outputs a turn signal corresponding to the operation. The automatic control switch is operated by the user in the vehicle interior 2a in order to instruct automatic control of the traveling state of the vehicle 2, and thereby outputs an automatic control signal according to the operation.

The vehicle control ECU 42 shown in FIG. 2 is mainly composed of a microcomputer having a processor and a memory, and is connected to the in-vehicle network 6. The vehicle control ECU 42 is one type or a plurality of types among an engine control ECU, a motor control ECU, a brake control ECU, a steering control ECU, an integrated control ECU, and the like.

Specifically, the engine control ECU controls the operation of the throttle actuator and the fuel injection valve of the internal combustion engine according to the operation of the accelerator pedal 26 in the vehicle interior 2a shown in FIG. To accelerate and decelerate. The motor control ECU accelerates/decelerates the vehicle speed of the host vehicle 2 by controlling the operation of the motor generator according to the operation of the accelerator pedal 26 in the vehicle interior 2a or automatically. The brake control ECU accelerates/decelerates the vehicle speed of the host vehicle 2 by controlling the operation of the brake actuator according to the operation of the brake pedal 27 in the vehicle interior 2a or automatically. The steering control ECU adjusts the steering angle of the host vehicle 2 by controlling the operation of the electric power steering according to the operation of the steering handle 24 in the vehicle interior 2a or automatically. The integrated control ECU synchronously controls the operation of the other ECUs based on, for example, output signals of the sensors 40 and 41, acquisition information of the surrounding monitoring ECU 31, and control information of other ECUs of the vehicle control ECU 42 other than itself.

As shown in FIGS. 1 and 2, the display system 5 is mounted on the vehicle 2 for visually presenting information. The display system 5 includes a HUD 50, an MFD (Multi Function Display) 51, a combination meter 52, and an HCU (HMI (Human Machine Interface) Control Unit) 54.

The HUD 50 is installed on the instrument panel 22 in the vehicle interior 2a shown in FIGS. The HUD 50 forms a display image 56 representing predetermined information by using, for example, a liquid crystal type or a scanning type projector 50a. The HUD 50 projects the display image 56 thus formed on the front windshield 21 as a “projection member” in the vehicle 2 through an optical system 50b such as a concave mirror. Here, the front windshield 21 is made of translucent glass so that the foreground 8 existing in front of the vehicle 2 outside the vehicle interior 2a is transmitted therethrough. At this time, the light flux of the display image 56 reflected by the front windshield 21 and the light flux from the foreground 8 that has passed through the shield 21 are perceived by the user on the driver's seat 20. As a result, the virtual image of the display image 56 formed at a position in front of the front windshield 21 is displayed by being superimposed on a part of the foreground 8 as shown in FIG. Will be visible.

In the present embodiment, two types of areas A1 and A2 are set in the display area as a range in which the virtual image of the display image 56 is displayed. First, the first display area A1 is set in order to superimpose the display image 56 of the virtual image display in association with the specific object in the foreground 8. The first display area A1 for the purpose of such association is adjusted by the HUD 50 so that the display image 56 is imaged at a distant position in the foreground 8 that is away from the host vehicle 2 forward by, for example, about 15 m. On the other hand, the second display area A2 is set so that the display image 56 is displayed as a virtual image without being associated with the specific object in the foreground 8. The second display area A2 for the purpose of disassociating the image is displayed by the HUD 50 from the first display area A1 so that the display image 56 is formed in the foreground 8 forward from the vehicle 2 at a short distance position of, for example, about 2 m. Is also adjusted downward and to a small size. That is, in the second display area A2, the display image 56 formed at a position closer to the host vehicle 2 than in the case of the first display area A1 is displayed as a virtual image.

Here, as for the projector 50a and the optical system 50b that form the HUD 50, as shown in FIG. 3, each may be provided for each of the display areas A1 and A2, or although not shown, either one is displayed. It may be provided commonly to the regions A1 and A2. Although not shown, as long as at least one type of display image 56 is associated with the specific object in the foreground 8, the display image 56 that is not associated may be displayed as a virtual image in the first display area A1. .. Although not shown, in the second display area A2, as long as at least one type of display image 56 is disassociated from the specific object in the foreground 8, the display image 56 that realizes such association is displayed as a virtual image. May be done.

As described above, as the display image 56 displayed by the HUD 50 as a virtual image in one of the display areas A1 and A2, a plurality of types of images as shown in FIGS. 4 to 7 are prepared in order to assist the user in driving the host vehicle 2. ing. Specifically, the plurality of types of display images 56 include at least an inter-vehicle distance image 560, an exit distance image 561, a road surface image 562, a weather image 563, a temperature image 564, a navigation image 565, a vehicle speed image 566, and a rotation speed image 567. Has been.

As shown in FIGS. 4 to 6, the inter-vehicle distance image 560 is displayed as a virtual image in the first display area A1 in association with another vehicle as a front obstacle. The inter-vehicle distance image 560 represents the inter-vehicle distance information between the vehicle and the nearest other vehicle traveling ahead of the host vehicle 2 among the obstacle information as the traffic information. In the inter-vehicle distance image 560, a standard display state as shown in FIG. 4 and a simple display state in which the display amount is restricted as compared with the standard display state as shown in FIGS. 5 and 6 are set. Here, the inter-vehicle distance image 560 in the standard display state indicates a number and a character respectively indicating a value and a unit of the inter-vehicle distance, a character indicating the meaning of the number, and the nearest other vehicle targeted by the number. It consists of the figure and the figure. On the other hand, in the inter-vehicle distance image 560 in the simple display state, the display amount is reduced by omitting the characters indicating the content.

As shown in FIGS. 4 to 6, the exit distance image 561 is displayed as a virtual image in association with the exit 7b of the tunnel 7 in the first display area A1. The exit distance image 561 represents, of the tunnel information, the arrival distance information to the nearest exit 7b to which the vehicle 2 heads. In the exit distance image 561, a standard display state as shown in FIG. 4 and a simple display state in which the display amount is limited as compared with the standard display state as shown in FIGS. 5 and 6 are set. Here, the exit distance image 561 in the standard display state indicates a numeral and a character indicating the value and unit of the reaching distance, a character indicating the meaning of the numeral, and the exit 7b targeted by the numeral. It is composed of figures and figures. On the other hand, the exit distance image 561 in the simple display state has the display amount reduced by omitting the characters indicating the content.

As shown in FIGS. 4 and 7, the road surface image 562 is displayed as a virtual image in the first display area A1 in association with the road ahead of the vehicle 2. The road surface image 562 represents the road surface information regarding the front traveling road of the host vehicle 2 among the traveling road information. In the road surface image 562, the standard display state as shown in FIG. 4 and the simple display state in which the display amount is restricted as compared with the standard display state as shown in FIG. 7 are set. Here, the road surface image 562 in the standard display state is composed of a figure that schematically shows the road surface state and characters that show the meaning of the figure. On the other hand, the road surface image 562 in the simple display state has the display amount reduced by omitting the characters indicating the contents.

As shown in FIGS. 4 and 7, the weather image 563 is displayed as a virtual image in the first display area A1 in association with the upper sky area in front of the vehicle 2. The weather image 563 represents weather information regarding the traveling environment of the host vehicle 2 among the weather information. In the weather image 563, a standard display state as shown in FIG. 4 and a simple display state in which the display amount is restricted as compared with the standard display state as shown in FIG. 7 are set. Here, the weather image 563 in the standard display state is composed of a figure that schematically shows the weather state and characters that indicate the meaning of the figure. On the other hand, the weather image 563 in the simple display state has the display amount reduced by omitting the character indicating the content.

As shown in FIGS. 4 and 7, the temperature image 564 is displayed as a virtual image in the first display area A1 in association with the upper sky area in front of the host vehicle 2. The temperature image 564 represents the temperature information regarding the traveling environment of the host vehicle 2 among the weather information. In the temperature image 564, a standard display state as shown in FIG. 4 and a simple display state in which the display amount is restricted as compared with the standard display state as shown in FIG. 7 are set. Here, the temperature image 564 in the standard display state is composed of numbers and letters respectively indicating the value and unit of the outside air temperature and letters showing the meaning of the numbers. On the other hand, the display amount of the temperature image 564 in the simple display state is reduced by omitting the characters indicating the content.

As shown in FIG. 4, the navigation image 565 is displayed as a virtual image in the first display area A1 in association with the road ahead of the host vehicle 2. The navigation image 565 represents navigation information for guiding the travel route to which the vehicle 2 is heading. The navigation image 565 is composed of at least a figure showing the planned traveling route of the vehicle 2 in the navigation information. The navigation information can be acquired in the HCU 54, which will be described in detail later, based on the map information stored in the memory 54b and the output signal of the vehicle state sensor 40.

As shown in FIG. 4, the vehicle speed image 566 is displayed as a virtual image at a fixed location in the second display area A2 that is not associated with the specific object. The vehicle speed image 566 represents vehicle speed information based on an output signal from the vehicle speed sensor of the vehicle state sensor 40. The vehicle speed image 566 is composed of numbers and letters respectively indicating the value and unit of the vehicle speed.

As shown in FIG. 4, the rotation speed image 567 is displayed as a virtual image side by side with the vehicle speed image 566 at a certain position in the second display area A2 that is not associated with the specific object. The rotation speed image 567 represents the engine rotation speed information based on the output signal from the rotation speed sensor of the vehicle state sensor 40. The rotation speed image 567 is composed of numbers and letters respectively indicating the value and unit of the engine rotation speed.

In addition, as the display image 56, in addition to the above images 560, 561, 562, 563, 564, 565, 566, 567, for example, music information or video information provided in the vehicle interior 2a of the vehicle 2 is displayed. An image or the like related to may be adopted. Further, by using the translucent combiner which is arranged on the instrument panel 22 and transmits the foreground 8 in cooperation with the front windshield 21, the virtual image display can be realized also by projecting the display image 56 on the combiner. It is possible.

The MFD 51 is installed on the center console 23 in the vehicle interior 2a shown in FIG. The MFD 51 displays a real image of an image formed by one or a plurality of liquid crystal panels so as to show predetermined information so that the user on the driver's seat 20 can visually recognize it. As the real image display by the MFD 51, display of an image showing one kind or plural kinds of information among navigation information, music information, video information and the like is adopted.

The combination meter 52 is installed on the instrument panel 22 in the vehicle interior 2a. The combination meter 52 displays the vehicle information regarding the host vehicle 2 so that the user on the driver's seat 20 can visually recognize the vehicle information. The combination meter 52 is a digital meter that displays vehicle information by an image formed on a liquid crystal panel, or an analog meter that displays a vehicle information by instructing a scale with a pointer. As the display by the combination meter 52, for example, a display showing one kind or plural kinds of information among the information such as the vehicle speed, the engine speed, the remaining fuel amount, the cooling water temperature, the turn switch and the automatic control switch is adopted. ..

As shown in FIG. 2, the HCU 54 is mainly composed of a microcomputer having a processor 54a and a memory 54b, and is connected to the display elements 50, 51, 52 of the display system 5 and the in-vehicle network 6. The HCU 54 synchronously controls the operation of the display elements 50, 51, 52. At this time, the HCU 54 executes operation control of the ECU 31 and the sensors 40 and 41 based on the acquired information or output signals, the control information of the ECU 42, the storage information of the memory 54b, the acquired information of the HCU 54, and the like. The memory 54b of the HCU 54 and the memory of other various ECUs are each configured by using one or a plurality of storage media such as a semiconductor memory and a magnetic medium or an optical medium.

Here, the HCU 54 of the present embodiment functions as a "vehicle display control device" so as to read the display image 56 stored as data in the memory 54b and display it on the HUD 50 as a virtual image. Specifically, the HCU 54 functionally implements each step of the display control flow shown in FIG. 8 by executing the display control program by the processor 54a. The display control flow is started in response to an on operation of the power switch serving as the occupant sensor 41 and ended in response to an off operation of the switch. Further, “S” in the display control flow means each step. Further, as an image storage unit for storing the display image 56 required in the display control flow, one of the memories of the built-in ECU of the display elements 50, 51, 52, or each of these memories and the memory 54b of the HCU 54 is used. It may be realized by jointly using a plurality of memories.

In S101 of the display control state flow, it is determined whether or not the timing at which the execution of S101 is started is the first timing T1 when the traveling position of the vehicle 2 is before the entrance 7a of the tunnel 7. At this time, the first timing T1 is adjusted to the timing at which the traveling position of the host vehicle 2 reaches the front by the set distance L1 from the entrance 7a as shown in FIG. Here, the set distance L1 that determines the first timing T1 is based on at least one type or a plurality of types of vehicle speed information, traffic information, tunnel information, road information, weather information, etc. of the host vehicle 2, for example. It is variably set to ensure safety. Therefore, for example, when the host vehicle 2 is traveling on a general road whose legal maximum speed is a predetermined speed, the vehicle 2 is traveling 100 m, or on an expressway whose legal maximum speed is higher than the general road. In this case, the set distance L1 is set to 200 m or the like.

As shown in FIG. 8, when a negative determination is made in S101, the process proceeds to S102 to execute normal control of virtual image display in each of the display areas A1 and A2, and then returns to S101. Specifically, in the normal control, as the display image 56, the inter-vehicle distance image 560, the exit distance image 561, the road surface image 562, the weather image 563, the temperature image 564, and the navigation image 565 are displayed in the first display area A1 as shown in FIG. A virtual image is displayed. At this time, for example, in this embodiment, the inter-vehicle distance image 560 and the road surface image 562 are displayed in bright red, the weather image 563 and the temperature image 564 are displayed in bright yellow, and the navigation image 565 is displayed in bright blue. .. Further, along with that, in the normal control, as the display image 56, the vehicle speed image 566 and the rotation speed image 567 are displayed as virtual images in the second display area A2 as shown in FIG. At this time, for example, the vehicle speed image 566 and the rotation speed image 567 are displayed in white. The brightness of each image 560, 561, 562, 563, 564, 565, 566, 567 can be adjusted by, for example, the RGB gradation value of the projector 50a, the light emission luminance value of the light source of the projector 50a, or the like. Is. Regarding the exit distance image 561, the virtual image display is started outside the tunnel 7 when the host vehicle 2 exceeds the traveling position separated from the entrance 7a of the tunnel 7 by a predetermined distance longer than the set distance L1. ing.

On the other hand, as shown in FIG. 8, when an affirmative determination is made in S101, the process proceeds to S103, and the respective information Ii, Io that is the tunnel inside/outside information I is acquired from the outside through the wireless communication device 40a. At this time, as the tunnel internal information Ii, at least illuminance information, traffic information, travel route information, and tunnel information regarding the internal situation of the front tunnel 7 are acquired. In addition, at this time, as the tunnel external information Io, at least illuminance information, traffic information, travel route information, and weather information regarding the external situation before the front tunnel 7 are acquired.

In subsequent S104, the provided information provided to the user inside the tunnel 7 is limited to the tunnel inside information Ii of the tunnel inside/outside information I acquired in S103. Specifically, the information provided to the user is the inter-vehicle distance information and the reaching distance information represented by the inter-vehicle distance image 560 and the exit distance image 561 in the first display area A1 as the tunnel internal information Ii necessary for driving the own vehicle 2. Is limited to. Therefore, the information represented by the road surface image 562, the weather image 563, the temperature image 564, and the navigation image 565 in the first display area A1 and the information represented by the vehicle speed image 566 and the rotation speed image 567 in the second display area A2 are The information is not provided to the user.

Here, the timing at which the execution of S104 is started can be simulated as the first timing T1 which is before the entrance 7a of the tunnel 7. Therefore, the information provided in the first display area A1 is substantially from the first timing T1 to the later-described second timing T2, that is, from before the entrance 7a outside the tunnel 7 to before the exit 7b inside the tunnel 7. It is limited to the inter-vehicle distance information and the reaching distance information. In addition, the limiting process limits the display range of the display image 56 to only the first display area A1 and changes the display color of the display image 56 to the display color of the inter-vehicle distance image 560 and the exit distance image 561 (for example, during normal control). It is also a process to limit to red of the same line).

In subsequent S105, the brightness of the display image 56 representing the tunnel internal information Ii restricted in S104 is adjusted according to the tunnel internal information Ii acquired in S103. Specifically, the inter-vehicle distance image 560 and the exit distance image 561 respectively representing the inter-vehicle distance information and the reaching distance information as the restricted tunnel internal information Ii are matched with the illuminance information inside the front tunnel 7 of the tunnel internal information Ii. The brightness is adjusted. At this time, the brightness of the inter-vehicle distance image 560 and the exit distance image 561 is adjusted to be darker than that in the normal control in S102 in accordance with the illuminance information inside the front tunnel 7. As a result, for example, in the present embodiment, the display color of the inter-vehicle distance image 560 and the exit distance image 561 is dark red.

Here, the timing at which the execution of S105 is started can also be simulated as the first timing T1 which is before the entrance 7a of the tunnel 7. Therefore, from the first timing T1 to the second timing T2 described later, that is, from the front of the entrance 7a outside the tunnel 7 to the front of the exit 7b inside the tunnel 7, an image displayed in the first display area A1. The brightness of 560 and 561 will be adjusted according to the illuminance information. From this, in the present embodiment, the first timing T1 corresponds to the “entrance adjustment timing”. The brightness of each of the images 560 and 561 can be adjusted by, for example, the RGB gradation value of the projector 50a, the light emission luminance value of the light source of the projector 50a, or the like.

In further subsequent S106, the display image 56 having the brightness limited to the information Ii in S104 and adjusted in S105 is displayed as a virtual image by the HUD 50. Specifically, both the inter-vehicle distance image 560 and the exit distance image 561 whose brightness is suppressed in the first display area A1 as compared with the normal control in S102 are simply displayed as shown in FIGS. A virtual image is displayed in this state. At this time, the virtual image display of the road surface image 562, the weather image 563, the temperature image 564, and the navigation image 565 in the first display area A1 and the virtual image display of the vehicle speed image 566 and the rotation speed image 567 in the second display area A2 are Disappear.

Here, the timing at which the execution of S106 is started can also be simulated as the first timing T1 which is before the entrance 7a of the tunnel 7. Therefore, the display image 56 in the first display area A1 is substantially from the first timing T1 to the later-described second timing T2, that is, from the front of the entrance 7a outside the tunnel 7 to the front of the exit 7b inside the tunnel 7. The display amount by is limited to the display amount by the images 560 and 561 in the simple display state. Therefore, FIG. 5 shows a display state outside the tunnel 7 from the first timing T1 to the timing when the host vehicle 2 enters the entrance 7a of the tunnel 7. On the other hand, FIG. 6 shows the display state inside the tunnel 7 from the timing when the host vehicle 2 enters the entrance 7a of the tunnel 7 to the second timing T2. From the above description, in the present embodiment, the first timing T1 also corresponds to the “entry restriction timing”.

By the way, as shown in FIG. 8, by executing S107 after the execution of S106, the execution of S107 is started at the second timing when the traveling position of the vehicle 2 is before the exit 7b of the tunnel 7. It is determined whether it is T2. At this time, the second timing T2 is adjusted to the timing at which the traveling position of the host vehicle 2 reaches the front by the set distance L2 from the exit 7b as shown in FIG. Here, the set distance L2 that determines the second timing T2 is variably set similarly to the set distance L1. Therefore, for example, when the host vehicle 2 is traveling on a general road whose legal maximum speed is a predetermined speed, the vehicle 2 is traveling 100 m, or on an expressway whose legal maximum speed is higher than the general road. In this case, the set distance L2 is set to 200 m or the like.

As shown in FIG. 8, when the negative determination is made in S107, the process returns to S106, and the virtual image display of the display image 56 for which the information is limited and the brightness is adjusted is continued. On the other hand, if an affirmative determination is made in S107, the process proceeds to S108, and the respective information Ii, Io that is the tunnel internal/external information I is acquired as in S103.

In subsequent S109, the provided information provided to the user before the exit 7b of the tunnel 7 is limited to the tunnel outside information Io of the tunnel inside/outside information I acquired in S108. Specifically, the information provided to the user is the tunnel external information Io necessary for driving the vehicle 2, and the road surface information and the weather information represented by the road surface image 562, the weather image 563, and the temperature image 564 in the first display area A1. And temperature information. Therefore, the information represented by the inter-vehicle distance image 560, the exit distance image 561 and the navigation image 565 in the first display area A1 and the information represented by the vehicle speed image 566 and the rotation speed image 567 in the second display area A2 are provided to the user. Is information that is not provided.

Here, the timing at which the execution of S109 is started can be simulated as the second timing T2, which is before the exit 7b of the tunnel 7. Therefore, from the second timing T2 to the third timing T3 described later, that is, from the front of the exit 7b inside the tunnel 7 to the exit at the exit 7b, the provided information in the first display area A1 is the road surface information. It will be limited to weather information and temperature information. In addition, the limiting process limits the display range of the display image 56 to only the first display area A1 and sets the display color of the display image 56 to the display color of the road surface information, the weather information, and the temperature information (for example, the same as that during normal control). It will also be a process to limit to yellow).

In subsequent S110, the brightness of the display image 56 representing the tunnel external information Io restricted in S109 is adjusted according to the tunnel external information Io acquired in S108. Specifically, the road surface image 562, the weather image 563, and the temperature image 564, which respectively represent the road surface information, the weather information, and the temperature information as the restricted tunnel external information Io, are the illuminance outside the front exit 7b of the tunnel external information Io. The brightness is adjusted according to the information and weather information. At this time, in particular, the brightness of the road surface image 562, the weather image 563, and the temperature image 564 is adjusted to be brighter than that during the adjustment in S105 in accordance with the illuminance information and the weather information outside the front exit 7b. As a result, for example, in the present embodiment, the display color of the road surface image 562, the weather image 563, and the temperature image 564 is dark yellow.

Here, the timing at which the execution of S110 is started can also be simulated as the second timing T2, which is before the exit 7b of the tunnel 7. Therefore, the image 562 displayed in the first display area A1 is substantially from the second timing T2 to the later-described third timing T3, that is, from before the exit 7b inside the tunnel 7 until the exit at the exit 7b. The brightness of 563 and 564 is adjusted according to the illuminance information and the weather information. Therefore, in the present embodiment, the second timing T2 corresponds to the "exit adjustment timing". The brightness of each image 562, 563, 564 can be adjusted by, for example, the RGB gradation value of the projector 50a, the light emission luminance value of the light source of the projector 50a, or the like.

Further, in S111, the display image 56 having the brightness limited in S109 and adjusted in S110 is displayed by the HUD 50 as a virtual image in S111. Specifically, the road surface image 562, the weather image 563, and the temperature image 564 whose brightness is higher than that at the time of adjustment in S105 in the first display area A1 are all in the simple display state as shown in FIG. Is displayed as a virtual image. At this time, the virtual image display of the inter-vehicle distance image 560, the exit distance image 561 and the navigation image 565 in the first display area A1 and the virtual image display of the vehicle speed image 566 and the rotation speed image 567 in the second display area A2 disappear. ..

Here, the timing at which the execution of S111 is started can also be simulated as the second timing T2, which is before the exit 7b of the tunnel 7. Therefore, the display image 56 is displayed in the first display area A1 substantially from the second timing T2 to the later-described third timing T3, that is, from before the exit 7b inside the tunnel 7 to the exit at the exit 7b. The amount is limited to the amount displayed by the images 562, 563, 564 in the simple display state. From the above description, in the present embodiment, the second timing T2 also corresponds to the “exit restriction timing”.

As shown in FIG. 8, the timing at which the execution of S112 is started by shifting to S112 after the completion of execution of S111 is the third timing T3 when the host vehicle 2 exits the exit 7b of the tunnel 7. It is determined whether or not. As a result, when a negative determination is made, the process returns to S111, while when an affirmative determination is made, the process returns to S101.

In the HCU 54 that realizes the display control state flow as described above, the functional part that executes S103 and S108 corresponds to the “information acquisition unit”, the functional part that executes S105 and S110 corresponds to the “adjustment unit”, and the S104 and The functional portion that executes 106, S109, and S111 corresponds to a "limitation unit".

(Effect)
As the present embodiment described above, the function and effect of the HCU 54 and the vehicle driving assistance system 1 including the HCU 54 will be described below.

First, according to the present embodiment, the brightness of the display image 56 is adjusted in accordance with the tunnel internal information Ii acquired by the HCU 54 at the first timing T1 before the entrance 7a of the tunnel 7. Here, since the tunnel internal information Ii representing the internal situation of the tunnel 7 is transmitted and acquired by wireless communication from the outside of the own vehicle 2, the internal situation immediately before the entry of the own vehicle 2 into the entrance 7a is It can be reflected in a timely and accurate manner. Therefore, according to the timely and accurate adjustment in accordance with the tunnel internal information Ii, the display image 56 having the brightness capable of ensuring the visual legibility of the foreground 8 which is the background of the display in the vehicle 2 is displayed at the entrance 7a. A virtual image can be displayed according to the entry into the.

Further, at the first timing T1 of the present embodiment, the brightness of the display image 56 is adjusted according to the illuminance information inside the tunnel 7 of the tunnel inside information Ii acquired by the HCU 54. Here, since the illuminance information is acquired by being transmitted by wireless communication from the outside of the vehicle 2 as the tunnel inside information Ii indicating the inside condition of the tunnel 7, the outside illuminance inside the tunnel 7 immediately before entering the entrance 7a is obtained. , Can be reflected in a timely and accurate manner. Therefore, according to the timely and accurate adjustment according to the illuminance information, the display image 56 with the brightness that can secure the visual readability with respect to the external illuminance inside the tunnel 7 is displayed as the virtual image according to the entry into the entrance 7a. It can be displayed.

Furthermore, at the first timing T1 of the present embodiment, the first display area A1 that associates the display image 56 with the specific object in the foreground 8 and the second display area A2 that does not associate the first display area A1. The brightness of the display image 56 in the area A1 is adjusted. According to this, it is possible to preferentially adjust the brightness of the display image 56, which is easy for the user to gaze by associating with the specific object, so that the visual legibility of the foreground 8 is ensured according to the entry into the entrance 7a. It will be possible.

Next, according to the present embodiment, at the second timing T2, which is before the exit 7b of the tunnel 7, the brightness of the display image 56 is adjusted according to the tunnel external information Io acquired by the HCU 54. Here, since the tunnel external information Io representing the external situation of the tunnel 7 is transmitted and acquired by wireless communication from the outside of the own vehicle 2, the external situation immediately before the exit of the own vehicle 2 at the exit 7b is It can be reflected in a timely and accurate manner. Therefore, according to the timely and accurate adjustment in accordance with the external information Io of the tunnel, the display image 56 having the brightness capable of ensuring the visual legibility of the foreground 8 which is the background of the display in the vehicle 2 is displayed at the exit 7b. The virtual image can be displayed according to the exit.

Further, at the second timing T2 of the present embodiment, the brightness of the display image 56 is adjusted according to the illuminance information outside the tunnel 7 in the tunnel outside information Io acquired by the HCU 54. Here, since the illuminance information is acquired by being transmitted by wireless communication from the outside of the vehicle 2 as the tunnel outside information Io indicating the outside condition of the tunnel 7, the outside illuminance outside the tunnel 7 immediately before exiting at the exit 7b is obtained. , Can be reflected in a timely and accurate manner. Therefore, according to the timely and accurate adjustment in accordance with the illuminance information, the display image 56 having the brightness capable of ensuring the visual readability with respect to the external illuminance outside the tunnel 7 is displayed as the virtual image according to the exit at the exit 7b. It can be displayed.

Further, at the second timing T2 of the present embodiment, the brightness of the display image 56 is adjusted according to the weather information outside the tunnel 7 in the tunnel outside information Io acquired by the HCU 54. Here, since the weather information is acquired by being transmitted by wireless communication from outside the vehicle 2 as the tunnel outside information Io indicating the outside condition of the tunnel 7, the weather condition outside the tunnel 7 immediately before exiting at the exit 7b can be obtained. , Can be reflected in a timely and accurate manner. Therefore, according to such timely and accurate adjustment in accordance with the accurate weather information, the display image 56 of the brightness that can ensure the visual legibility for the weather condition outside the tunnel 7 can be exited at the exit 7b. Accordingly, a virtual image can be displayed.

Furthermore, at the second timing T2 of the present embodiment as well, the first display area A1 that associates the display image 56 with the specific object in the foreground 8 and the second display area A2 that removes the association The brightness of the display image 56 in the display area A1 is adjusted. According to this, it is possible to preferentially adjust the brightness of the display image 56, which is easy for the user to gaze by associating with the specific target object, so that the visual legibility for the foreground 8 is secured according to the exit 7b. It will be possible.

Now, inside the tunnel 7 of the present embodiment, the information provided by the display image 56 is limited to the tunnel inside information Ii of the tunnel inside/outside information I acquired by the HCU 54. Here, since the tunnel inside information Ii representing the inside situation of the tunnel 7 is transmitted and acquired by wireless communication from outside the own vehicle 2 as the tunnel inside/outside information I representing the inside/outside situation of the tunnel 7, the own vehicle 2 It is possible to accurately and accurately reflect the internal situation when the vehicle is traveling. Therefore, according to the timely and accurate restriction to the information type, when traveling inside the tunnel 7, the amount of information provided to the foreground 8 which is the background of the display in the own vehicle 2 can be ensured to be visually legible. The display image 56 representing the provided information can be displayed as a virtual image by narrowing down.

Further, inside the tunnel 7 of the present embodiment, of the tunnel inside/outside information I acquired by the HCU 54, the provided information by the display image 56 is limited to the tunnel inside information Ii necessary for driving the host vehicle 2. According to this, it is possible to provide the tunnel internal information Ii within the tunnel 7, which is difficult for the user to look aside, by focusing on the amount of information necessary for driving the host vehicle 2. Therefore, it is possible to secure the visual readability of the display image 56 with respect to the foreground 8 while giving the user a sense of security when traveling inside the tunnel 7.

Further, according to the present embodiment, the restriction on the tunnel internal information Ii is started from the first timing T1 which is before the entrance 7a of the tunnel 7. As a result, inside the tunnel 7, the information provided by the display image 56 can be surely limited to the tunnel internal information Ii even after the vehicle 2 enters the entrance 7a, so that the visibility of the foreground 8 can be ensured. Becomes

Furthermore, inside the tunnel 7 of the present embodiment, not only the information provided by the display image 56 is limited to the tunnel internal information Ii, but also the display color of the display image 56 representing the tunnel internal information Ii is limited. According to the information restriction and the display color restriction, it is possible to surely secure the visible legibility for the foreground 8 that is required when the user travels inside the tunnel 7 that is difficult for the user to look aside.

In addition, inside the tunnel 7 of the present embodiment, not only the provided information by the display image 56 is limited to the tunnel internal information Ii, but also the display range of the display image 56 representing the tunnel internal information Ii is limited. According to the information restriction and the display range restriction, it is possible to surely secure the visible legibility for the foreground 8 which is required when the user travels inside the tunnel 7 in which the user is not allowed to look aside.

In addition, inside the tunnel 7 of the present embodiment, not only the provided information by the display image 56 is limited to the tunnel internal information Ii, but also the display amount of the display image 56 representing the tunnel internal information Ii is limited. .. According to the information limitation and the display amount limitation, it is possible to surely secure the visual comprehensibility for the foreground 8 which is required when the user travels inside the tunnel 7 in which it is difficult for the user to look aside.

In addition to the above, in the tunnel 7 of the present embodiment, the first display area A1 that associates the display image with the specific object in the foreground 8 and the second display area A2 that removes the association from the first display area A1. The provided information in the area A1 is limited to the tunnel internal information Ii. According to this, it is possible to preferentially reduce the amount of information provided by the display image 56 that is easy for the user to gaze by associating with the specific object, so that the visibility of the foreground 8 is improved when the vehicle travels inside the tunnel 7. Can be secured.

Here, in particular, according to the present embodiment, at the second timing T2 before the exit 7b of the tunnel 7, the information provided by the display image 56 is replaced with the tunnel internal information Ii of the tunnel internal/external information I acquired by the HCU 54. , Limited to the tunnel external information Io. Here, since the tunnel external information Io representing the external situation of the tunnel 7 is transmitted and acquired by radio communication from outside the vehicle 2 as the tunnel internal/external information I representing the internal/external situation of the tunnel 7, it is obtained at the exit 7b. It is possible to accurately and timely reflect the external situation immediately before the exit of. Therefore, according to the timely and accurate restriction to the information type, the provided information is narrowed down to the amount of information that can ensure the visual legibility of the foreground 8 which is the background of the display in the vehicle 2. The displayed display image 56 can be displayed as a virtual image in accordance with the exit at the exit 7b.

Further, at the second timing T2 of the present embodiment, of the tunnel inside/outside information I acquired by the HCU 56, the provided information by the display image 56 is limited to the tunnel outside information Io necessary for driving the own vehicle 2. According to this, the user can be provided with the tunnel outside information Io by narrowing down to the information amount necessary for driving the own vehicle 2 immediately before exiting at the exit 7b where it is difficult to look aside. Therefore, it is possible to secure the visual readability of the display image 56 with respect to the foreground 8 while giving the user a sense of security in response to the exit at the exit 7b.

Further, at the second timing T2 of the present embodiment, the display color, the display range, and the display amount of the display image 56 representing the tunnel external information Io are limited according to the processing inside the tunnel 7 described above. Become. Therefore, it is possible to reliably secure the visual legibility required for the foreground 8 in response to the exit from the exit 7b, which is difficult for the user to look aside.

Furthermore, at the second timing T2 of the present embodiment, of the first display area A1 that associates the display image 56 with the specific object in the foreground 8 and the second display area A2 that has removed the association, the first The provided information in the display area A1 is limited to the tunnel external information Io. According to this, it is possible to preferentially reduce the information amount of the provided information by the display image 56 that is easily watched by the user by associating with the specific target object, and therefore the visual readability with respect to the foreground 8 depends on the exit 7b. Can be secured.

As described above, according to the vehicle driving assist system 1 including the HCU 54 of the present embodiment, the visibility of the display image 56 displayed as a virtual image is improved with respect to the foreground 8 inside and outside the tunnel 7 which is the background of the display. It is possible to secure it.

(Other embodiments)
Although one embodiment of the present invention has been described above, the present invention is not construed as being limited to the embodiment and may be applied to various embodiments without departing from the scope of the present invention. it can.

Specifically, as a first modification, as shown in FIG. 10, the brightness of each image 560, 561, 562, 563, 564, 565, 566, 567 is changed to S105 by sequentially shifting from S103 to S113 and S114. The virtual image display similar to the normal control in S102 may be executed except that the adjustment is performed according to. In this case, in S115 following S114, it is determined whether or not the timing at which the execution of S115 is started is the fourth timing T4 when the host vehicle 2 enters the entrance 7a of the tunnel 7. As a result, when a negative determination is made, the process returns to S114, while when an affirmative determination is made, the process proceeds to S104.

As a second modification, as shown in FIG. 11, by sequentially shifting from S103 to S116 and S117, the same brightness as in the normal control in S102 is maintained, and the limitation and virtual image display according to S104 and S106 are executed. You may. In this case, in S118 subsequent to S117, it is determined whether or not the timing at which the execution of S118 is started is the fourth timing T4 when the host vehicle 2 enters the entrance 7a of the tunnel 7. As a result, when the negative determination is made, the process returns to S117, while when the positive determination is made, the process proceeds to S104.

As a modified example 3, as shown in FIG. 12, by executing S119 instead of S101, the timing at which the execution of S118 is started is the fourth timing when the host vehicle 2 enters the entrance 7a of the tunnel 7. You may determine whether it is T4. As a result, when the negative determination is made, the process proceeds to S102, while when the positive determination is made, the process proceeds to S103.

As a fourth modification, as shown in FIG. 13, by sequentially shifting from S108 to S120 and S121, the brightness of each image 560, 561, 562, 563, 564, 565, 566, 567 conforms to S110. Other than the adjustment, the virtual image display similar to the normal control in S102 may be executed. In this case, in S122 following S121, it is determined whether or not the timing at which the execution of S122 is started is the third timing T3 when the vehicle 2 exits the exit 7b of the tunnel 7. As a result, when a negative determination is made, the process returns to S121, while when an affirmative determination is made, the process returns to S101.

As a fifth modification, as shown in FIG. 14, by sequentially shifting from S108 to S123 and S124, the limitation and virtual image display according to S109 and S111 are executed with the same brightness as that at the time of adjustment in S105. You may. In this case, in S125 following S124, it is determined whether or not the timing at which the execution of S125 is started is the third timing T3 when the host vehicle 2 exits the exit 7b of the tunnel 7. As a result, if the negative determination is made, the process returns to S124, while if the positive determination is made, the process returns to S101.

As a modified example 6, as shown in FIG. 15, by executing S126 instead of S107, the timing at which the execution of S126 is started is the third timing when the host vehicle 2 exits the exit 7b of the tunnel 7. You may determine whether it is T3. As a result, when the negative determination is made, the process returns to S106, while when the positive determination is made, the process proceeds to S101.

As Modification 7, any one of Modifications 1 to 3 and any one of Modifications 4 to 6 may be combined. Here, FIG. 16 shows a modified example 7 in which the modified example 1 and the modified example 4 are combined, and FIG. 17 shows a modified example 7 in which the modified example 2 and the modified example 5 are combined. As a modified example 8, in the images 560, 561, 564 in the simple display state as shown in FIG. 18, in addition to or instead of the characters indicating the contents in the standard display state, the characters indicating the unit in the standard display state are displayed. It may be omitted.

As a modified example 9, in addition to or instead of the illuminance information, the brightness adjustment in S105 is adjusted to, for example, traveling road information (specifically, road surface state) or external light information (specifically, the direction of the solar radiation). You may execute it. As a tenth modification, in addition to or instead of at least one of the illuminance information and the weather information, the brightness adjustment in S110 is performed, for example, traveling road information (specifically, road surface state) and external light information (specifically,). It may be executed according to the direction of solar radiation).

As the provided information restricted in S104 of the modified example 11, as long as it becomes the tunnel internal information Ii necessary for driving the own vehicle 2, for example, traffic jam information other than the inter-vehicle distance information and the reach distance information may be adopted. Good. The provided information restricted in S109 of the modified example 12 is, for example, inter-vehicle distance information, traffic jam information, etc. other than road surface information, weather information and temperature information, as long as it is tunnel external information Io necessary for driving the own vehicle 2. May be adopted.

As the provided information of the modified example 13, as long as it is limited to the tunnel internal information Ii in S104, in addition to or in place of the information necessary for driving the own vehicle 2, information unnecessary for the same driving (for example, as obstacle information Vehicle types, etc.) may be adopted. In addition to or in place of the information necessary for driving the own vehicle 2, as the provided information of the modified example 14, as long as it is limited to the tunnel outside information Io in S109, information unnecessary for the same driving (for example, as obstacle information Vehicle types, etc.) may be adopted. In addition, in the case of these modifications 13 and 14, the display image 56 showing the provided information adopted is displayed as a virtual image in S106 or S111.

As a fifteenth modified example, all the information provided in the display areas A1 and A2 during normal control is adopted without being restricted in S104, so that at least the latter of the display color and the display range of the display image 56 is restricted. You don't have to. As a modified example 16, all of the information provided in the display areas A1 and A2 during normal control is adopted without being restricted in S109, so that at least the latter of the display color and the display range of the display image 56 is restricted. You don't have to. In addition, in the case of these modified examples 15 and 16, the display image 56 showing the adopted information adopted is displayed as a virtual image in S106 or S111.

As a modified example 17, the display amount of the display image 56 may not be limited by adopting the standard display state instead of the simple display state in S106. As a modification 18, by adopting the standard display state instead of the simple display state in S111, it is not necessary to limit the display amount of the display image 56.

As a modified example 19, at least one kind of the information provided in the second display area A2 during normal control is adopted without limitation in S104, and the information provided in the second display area A2 is not limited in S104. The brightness may be adjusted similarly to the provided information in the first display area A1. As a modified example 20, at least one type of the information provided in the second display area A2 during the normal control is adopted without limitation in S109, and the information provided in the second display area A2 is not limited in S110. The brightness may be adjusted similarly to the provided information in the first display area A1. In addition, in the case of these modifications 19 and 20, the display image 56 showing the provided information adopted is displayed as a virtual image in S106 or S111.

As a modification example 21, the virtual image display of the display image 56 in the second display area A2 may not be adopted. As a modified example 22, the display image 56 whose information is limited and the brightness is adjusted by the display control flow may be displayed as a virtual image in the second display area A2 instead of the first display area A1. As the modified example 23, the virtual image display of the display image 56 in the first display area A1 may not be adopted in the modified example 22.

As a modification 24, at least a part of the steps of the display control flow may be realized by hardware by one or a plurality of ICs or the like instead of being realized by the HCU 54 functionally. As a modification 25, in addition to or instead of the HCU 54, one or more types of the peripheral monitoring ECU 31 and the display control ECUs of the display elements 50, 51, 52 may be made to function as a “vehicle display control device”. Good.

1 vehicle driving assist system, 2 own vehicle, 5 display system, 7 tunnel, 7a entrance, 7b exit, 8 foreground, 21 front windshield, 40 vehicle condition sensor, 40a wireless communication device, 50 HUD, 54 HCU, 56 display image 560 vehicle distance image, 561 exit distance image, 562 road surface image, 563 weather image, 564 temperature image, 565 navigation image, 566 vehicle speed image, 567 rotation speed image, A1 first display area, A2 second display area, I tunnel Inside/outside information, Ii tunnel inside information, Io tunnel outside information, L1, L2 set distance, L2 set distance, T1 first timing, T2 second timing, T3 third timing, T4 fourth timing.

Claims (18)

A vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image that can be visually recognized by the user. In the vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S103 , S108 ) for acquiring tunnel internal information (Ii) transmitted from the outside of the vehicle by wireless communication and representing the internal state of the tunnel (7),
At the entrance adjustment timing (T1) before the entrance (7a) of the tunnel, an adjustment unit (S105 , S110 ) for adjusting the brightness of the display image according to the tunnel internal information acquired by the information acquisition unit. steal, equipped,
The information acquisition unit acquires the tunnel internal information including illuminance information inside the tunnel,
Wherein the adjusting unit at an inlet adjustment timing, the out of the tunnel internal information acquired by the information acquisition unit, at least the car dual display control unit to adjust the brightness of the display image in accordance with the illuminance information. Vehicle display for controlling virtual image display in the first display area (A1) that associates the display image with the specific object in the foreground and virtual image display in the second display area (A2) that is not associated with the display image. In the control device (54),
The adjustment unit, the brightness of the display image in the first display area, the vehicle display control device according to claim 1 for adjusting at the inlet adjustment timing. The information acquisition unit is the tunnel external information is transmitted by wireless communication from the outside of the vehicle showing the external conditions of the tunnel (Io), acquires,
The adjustment unit, at the exit of the tunnel (7b) before and becomes outlet adjustment timing (T2), to adjust the brightness of the display image in accordance with the said tunnel external information acquired by the information acquisition unit,
The information acquisition unit acquires the tunnel external information including illuminance information outside the tunnel,
The adjusting unit at the outlet adjustment timing, the out of the acquired said tunnel external information by the information acquisition unit, according to claim 1 or 2 for adjusting the brightness of the display image in accordance with the at least the illuminance information Vehicle display control device. A vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image that can be visually recognized by the user. In the vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S108) for acquiring tunnel external information (Io) transmitted from the outside of the vehicle by wireless communication and representing the external condition of the tunnel (7),
At the exit adjustment timing (T2) before the exit (7b) of the tunnel, an adjustment unit (S110) that adjusts the brightness of the display image in accordance with the external information of the tunnel acquired by the information acquisition unit. , Prepare,
The information acquisition unit acquires the tunnel external information including illuminance information outside the tunnel,
The vehicle display control device, wherein the adjustment unit adjusts the brightness of the display image in accordance with at least the illuminance information in the tunnel external information acquired by the information acquisition unit at the exit adjustment timing. Vehicle display for controlling virtual image display in the first display area (A1) that associates the display image with the specific object in the foreground and virtual image display in the second display area (A2) that is not associated with the display image. In the control device (54),
The vehicle display control device according to claim 3 , wherein the adjustment unit adjusts the brightness of the display image in the first display area at the exit adjustment timing. A vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image that can be visually recognized by the user. In the vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S108) for acquiring tunnel external information (Io) transmitted from the outside of the vehicle by wireless communication and representing the external condition of the tunnel (7),
At the exit adjustment timing (T2) before the exit (7b) of the tunnel, an adjustment unit (S110) that adjusts the brightness of the display image in accordance with the external information of the tunnel acquired by the information acquisition unit. , Prepare,
Vehicle display for controlling virtual image display in the first display area (A1) that associates the display image with the specific object in the foreground and virtual image display in the second display area (A2) that is not associated with the display image. In the control device (54),
The adjustment unit adjusts the brightness of the display image in the first display area at the exit adjustment timing ,
The information acquisition unit acquires the tunnel external information including illuminance information outside the tunnel,
The vehicle display control device , wherein the adjustment unit adjusts the brightness of the display image in accordance with at least the illuminance information in the tunnel external information acquired by the information acquisition unit at the exit adjustment timing . The information acquisition unit, the obtains the tunnel external information including said luminance information and weather information in the external of the tunnel,
The adjusting unit at the outlet adjusting timing of said tunnel external information acquired by the information acquisition unit, according to claim 3-6 to adjust the brightness of the display image in accordance with the said illuminance information and the weather information The display control device for a vehicle according to any one of 1. A vehicle (2) equipped with a head-up display (50) for projecting a display image (56) onto a projection member (21) that transmits the foreground (8) and displaying the display image as a virtual image that can be visually recognized by the user. In the vehicle display control device (54) for controlling the virtual image display,
An information acquisition unit (S103 , S108 ) for acquiring tunnel inside/outside information (I) transmitted from outside the vehicle by wireless communication and representing the inside/outside state of the tunnel (7);
In the inside of the tunnel, the provision information to be provided to the user by the display image is included in the tunnel inside information (Ii) indicating the inside situation of the tunnel among the inside and outside information of the tunnel acquired by the information acquisition unit. A vehicle display control device comprising: a limiting unit (S104, S106 , S109, S111 ) for limiting. The vehicle display control device according to claim 8 , wherein the restriction unit restricts the provided information inside the tunnel to the tunnel internal information necessary for driving the own vehicle. The vehicle display control device according to claim 8 or 9 , wherein the restriction unit starts restriction on the inside information of the tunnel from an entrance restriction timing (T1) before the entrance (7a) of the tunnel. The vehicle display control device according to any one of claims 8 to 10 , wherein the restriction unit restricts a display color of the display image representing the inside information of the tunnel inside the tunnel. The vehicle display control device according to any one of claims 8 to 11 , wherein the restriction unit restricts a display range of the display image representing the inside information of the tunnel inside the tunnel. The vehicle display control device according to any one of claims 8 to 12 , wherein the limiting unit limits the display amount of the display image representing the inside information of the tunnel inside the tunnel. Vehicle display for controlling virtual image display in the first display area (A1) that associates the display image with the specific object in the foreground and virtual image display in the second display area (A2) that is not associated with the display image. In the control device (54),
The vehicle display control device according to any one of claims 8 to 13 , wherein the limiting unit limits the provided information in the first display area to the tunnel internal information inside the tunnel. Wherein the restriction unit is the providing information at the exit of the tunnel (7b) before and becomes outlet limit timing (T2), of the tunnel and out information more acquired in the information acquisition unit, the outside of the tunnel The vehicle display control device according to any one of claims 8 to 14 , wherein the tunnel external information (Io) representing the situation is limited. The vehicle display control device according to claim 15 , wherein the restriction unit restricts the provided information to the tunnel outside information necessary for the user to drive the vehicle at the exit restriction timing. Vehicle display for controlling virtual image display in the first display area (A1) that associates the display image with the specific object in the foreground and virtual image display in the second display area (A2) that is not associated with the display image. In the control device,
The vehicle display control device according to claim 15 or 16 , wherein the restriction unit restricts the provided information in the first display area to the tunnel outside information at the exit restriction timing. A vehicle driving assist system (1) for assisting driving of a host vehicle, comprising:
A vehicle display control device (54) according to any one of claims 1 to 18 ,
A vehicle driving assistance system comprising the head-up display (50).

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